CVE-2026-40212 Cross-site scripting in Skyline
An attacker can execute arbitrary scripts in the console web interface via DOM-based XSS, potentially compromising administrator sessions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-40212?
CVE-2026-40212 is a medium-severity cross-site scripting vulnerability in OpenStack Skyline, published on 10 Apr 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
OpenStack Skyline before 5.0.1, 6.0.0, and 7.0.0 has a DOM-based Cross-Site Scripting (XSS) vulnerability in the console because document.write is used unsafely, which is relevant in scenarios where administrators use the console web interface to view instance console logs.
Weakness: CWE-79
Which versions are affected by CVE-2026-40212?
How do I fix CVE-2026-40212?
No fix has been published for CVE-2026-40212 yet. Limit exposure of the affected software until one is available.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-40212 being exploited?
There is no known exploitation of CVE-2026-40212 in the wild and no public exploit code.
Sources
Also known as GHSA-h7hj-cr59-59c2.